Absence

Sorry I couldn't be with you today! If you have a project to show me, we'll have to wait until I return. If you have a project to bring home, please bring it home today!

Balance Chemical Equations

When chemical reactions (like fire) happen, atoms can join new molecules but they CANNOT disappear. When we "balance chemical equations", we try to understand what happens to each of the atoms. Follow the picture/link below, and click Run Now. Click "Balance Scales" to help see what is going on!

For CP Classes (per 3, 4/5): Finish all three reactions in the introduction (Make Ammonia, Separate Water, Combust Methane). Take a screen shot of each when you see the smiley face! Work on Level 1 of the Balancing Game on the top tab.
For Honors Classes (per 1, 78, 10): Do the CP work, and finish at least Level 2 of the Balancing Game.

CE7: Balancing Chemical Equations

Try the Quia activity below!

For example, if you had two carbon dioxide molecules, it would look like this: 2(CO2). That is the same thing as CO2 + CO2 . In your “atom inventory”, you would have 2 carbon atoms and 4 oxygen atoms.

We put the "Before" and "After" molecules on opposite sides of an equal sign, and look to see if they balance. For example,

• C + O => CO2 is not a balanced equation, because you have more oxygen on the right side than you do on the left.
• C + O2 => CO2 is a balanced equation, because number of atoms matches up on both sides.

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